4 papers · 1 filter
Population II Post-AGB Stars. I. Methodology, Initial Results, and the First Luminosity Function
S. Jean Feeser, Robin Ciardullo, Michael H. Siegel +2
Post-asymptotic giant branch (PAGB) stars share many advantages with the tip of the red giant branch (TRGB) for Population II distance measurements, including minimal internal redd…
Full orbital solution and dynamical masses for a new shell-Be + sdOB binary AN Col
R. Klement, Th. Rivinius, A. C. Carciofi +4
AN~Col is a shell Be star that has shown transient spectral features caused by a hot, evolved companion on a months-long orbit. If confirmed, this would place it among the growing…
Detection and Astrometry of the Ba-Bb Subsystem in Piscium: First Dual-Field Interferometry at the CHARA Array
Narsireddy Anugu, Robert Klement, John D. Monnier +14
We present the first on-sky demonstration of dual-field interferometry at the CHARA Array and the first direct resolution of the inner Ba--Bb subsystem in the bright hierarchical t…
Spectroscopic Survey of Faint Planetary-Nebula Nuclei. V. The EGB 6-Type Central Star of Abell 57
Howard E. Bond, Akshat S. Chaturvedi, Robin Ciardullo +3
During our spectroscopic survey of central stars of faint planetary nebulae (PNe), we found that the nucleus of Abell 57 exhibits strong nebular emission lines. Using synthetic nar…